Java后台转换成树结构 素颜马尾好姑娘i 2022-11-15 11:46 111阅读 0赞 package cn.ccccltd.ccccoi.mediumterminvestment.domain; import java.io.Serializable; import java.util.List; /** * @Description:返回前端,业务模块 * @author yujiaqi * @date: 2019年9月9日下午2:07:19 */ public class ProjectBasicInfoDTO implements Serializable { private static final long serialVersionUID = 1L; private String id; private String pId; private String key; private String title; private String value; private List<ProjectBasicInfoDTO> children; private Boolean selectable; private Boolean disableCheckbox; private Boolean disabled; public String getId() { return id; } public String getValue() { return value; } public void setValue(String value) { this.value = value; } public void setId(String id) { this.id = id; } public String getpId() { return pId; } public void setpId(String pId) { this.pId = pId; } public String getKey() { return key; } public void setKey(String key) { this.key = key; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public List<ProjectBasicInfoDTO> getChildren() { return children; } public void setChildren(List<ProjectBasicInfoDTO> children) { this.children = children; } public Boolean getSelectable() { return selectable; } public void setSelectable(Boolean selectable) { this.selectable = selectable; } public Boolean getDisableCheckbox() { return disableCheckbox; } public void setDisableCheckbox(Boolean disableCheckbox) { this.disableCheckbox = disableCheckbox; } public Boolean getDisabled() { return disabled; } public void setDisabled(Boolean disabled) { this.disabled = disabled; } public static long getSerialversionuid() { return serialVersionUID; } } service实现类: /** * 查询投资项目资金来源 */ @Override public List<ProjectBasicInfoDTO> queryFundingSource() { //查询投资项目资金来源 List<DictionaryBean> list = projectBasicInfoMapper.queryDictionaryBean(Constant.FUNDING_SOURCE,Constant.DELFLAG); List<ProjectBasicInfoDTO> dataProcessing = ProjectBasicInfoServiceImpl.dataProcessing(list); List<ProjectBasicInfoDTO> buildByRecursive = TreeUtils.buildByRecursive(dataProcessing); return buildByRecursive; } /** * 将字典数据遍历放入ProjectBasicInfoDTO实体中 * @param list * @return */ public static List<ProjectBasicInfoDTO> dataProcessing(List<DictionaryBean> list){ List<ProjectBasicInfoDTO> list1 = Lists.newArrayList(); for (DictionaryBean dictionaryBean : list) { ProjectBasicInfoDTO projectBasicInfoDTO = new ProjectBasicInfoDTO(); projectBasicInfoDTO.setId(dictionaryBean.getItemId()); projectBasicInfoDTO.setpId(dictionaryBean.getItemParentId()); projectBasicInfoDTO.setKey(dictionaryBean.getItemId()); projectBasicInfoDTO.setTitle(dictionaryBean.getItemFullName()); projectBasicInfoDTO.setValue(dictionaryBean.getItemFullName()); projectBasicInfoDTO.setSelectable(false); projectBasicInfoDTO.setDisableCheckbox(true); projectBasicInfoDTO.setDisabled(true); list1.add(projectBasicInfoDTO); } return list1; } 递归方法工具类 package cn.ccccltd.ccccoi.mediumterminvestment.util; import java.util.ArrayList; import java.util.List; import cn.ccccltd.ccccoi.mediumterminvestment.domain.ProjectBasicInfoDTO; public class TreeUtils { /** * 使用递归方法建树 * @param treeNodes * @return */ public static List<ProjectBasicInfoDTO> buildByRecursive(List<ProjectBasicInfoDTO> projectBasicInfoDTOs) { List<ProjectBasicInfoDTO> trees = new ArrayList<ProjectBasicInfoDTO>(); for (ProjectBasicInfoDTO projectBasicInfoDTO : projectBasicInfoDTOs) { if ("".equals(projectBasicInfoDTO.getpId()) || projectBasicInfoDTO.getpId() == null ) { trees.add(findChildren(projectBasicInfoDTO,projectBasicInfoDTOs)); } } return trees; } /** * 递归查找子节点 * @param treeNodes * @return */ public static ProjectBasicInfoDTO findChildren(ProjectBasicInfoDTO projectBasicInfoDTO,List<ProjectBasicInfoDTO> projectBasicInfoDTOs) { for (ProjectBasicInfoDTO projectBasicInfoDTO2 : projectBasicInfoDTOs) { if(projectBasicInfoDTO.getId().equals(projectBasicInfoDTO2.getpId())) { if(projectBasicInfoDTO.getChildren() == null) { projectBasicInfoDTO.setChildren(new ArrayList<ProjectBasicInfoDTO>()); } //是否还有子节点,如果有的话继续往下遍历,如果没有则直接返回 projectBasicInfoDTO.getChildren().add(findChildren(projectBasicInfoDTO2,projectBasicInfoDTOs)); } } return projectBasicInfoDTO; } } 树形结构效果图: ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMwNjMxMDYz_size_16_color_FFFFFF_t_70][] [watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMwNjMxMDYz_size_16_color_FFFFFF_t_70]: /images/20221022/a17a319767c24937a99cfb38dd210468.png
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